Arjun, Eblighted by Spirits

Prowess
Whenever you cast a card from exile gain a experience counter.
Whenever Arjun attacks, exile the top X+1 cards of the top of your library, where X is the number of experience counters you have. You may cast cards exiled this way until end of combat. For every card cast this way create a 1/1 red and white spirit token with haste and prowess that enters tapped an attacking. Exile them at the end of combat.
You may cast cards from exile as thought they had flash.